Yeah, they'll fit. I've got the back wheel off a Whyte Malvern in my garage and I've just measured it at 0.5mm wider externally than the Mavic 717s on my MTB. They take 2,25in tyres just fine, so whatever fits between the stays of the Whyte will be OK.

Chart is from here: http://sheldonbrown.com/tire-sizing.html. And does say the following underneath:
Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem.